How should an emergency brake be applied?

Answer: A — Rapidly and firmly

An emergency brake should be applied rapidly and firmly in order to quickly and effectively stop a vehicle in an emergency situation. Applying the brake gradually or slowly may not provide enough force to stop the vehicle quickly enough. Pumping the brake pedal quickly is also not recommended as it can cause the brakes to overheat and lose effectiveness. It is important to apply the brake in one swift, firm motion to ensure the best chance of avoiding a potential accident.